How to convert byte[] to Byte[] and the other way around?

Question

How to convert byte[] to Byte[] and also Byte[] to byte[], in the case of not using any 3rd party library?

Is there a way to do it fast just using the standard library?

Answer 1

byte[] to Byte[] :

byte[] bytes = ...; Byte[] byteObject = ArrayUtils.toObject(bytes); 

Byte[] to byte[] :

Byte[] byteObject = new Byte[0]; byte[] bytes = ArrayUtils.toPrimitive(byteObject); 

Answer 2

Byte class is a wrapper for the primitive byte. This should do the work:

byte[] bytes = new byte[10]; Byte[] byteObjects = new Byte[bytes.length];  int i=0;     // Associating Byte array values with bytes. (byte[] to Byte[]) for(byte b: bytes)    byteObjects[i++] = b;  // Autoboxing.  ....  int j=0; // Unboxing Byte values. (Byte[] to byte[]) for(Byte b: byteObjects)     bytes[j++] = b.byteValue();